Maybe the OP is referring to a bathtub shower combo. My old Pace Arrow had one of those. Had to left leg about 18-20 inches to get in. My Safari has only about a 6 inch lip to step in over.
2008 Fleetwood Southwind 36D
8.1L Vortec Gas with 5SP Allison Tranny
W-24 Workhorse Chassis